envsetup: allow using mka for mm{,m}

Change-Id: I6c0fce5e67a3b5c49023d3c00825e35b08d41845
Revert "Allow disabling DroidDoc build."

This reverts commit 875e83165081425e74ce7c999b51c01cac0c876c

Change-Id: I670a1bea555cc7ac8346fba347b9cb40092c3da1
Merge remote branch 'cm/cm-10.1'